CN108173266A - A kind of DC uninterrupted electric power system and method for supplying power to - Google Patents
A kind of DC uninterrupted electric power system and method for supplying power to Download PDFInfo
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- CN108173266A CN108173266A CN201810071936.1A CN201810071936A CN108173266A CN 108173266 A CN108173266 A CN 108173266A CN 201810071936 A CN201810071936 A CN 201810071936A CN 108173266 A CN108173266 A CN 108173266A
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- Prior art keywords
- switch
- power supply
- output terminal
- supply unit
- battery pack
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a kind of DC uninterrupted electric power system and method for supplying power to, the electric power system includes battery pack, charger and at least one power supply unit, serial connection charge device between the output terminal of power supply unit and the input terminal of battery pack, the output terminal of power supply unit is connect with external output terminal, and first switch and the first thermistor are in series between the output terminal of battery pack and external output terminal；Included the following steps using the method that above-mentioned electric power system is powered：Step 1, using at least one externally fed mode, direct current is exported by external output terminal；Step 2, when detecting that externally fed inputs instant power-down, then first switch is connected in the first duration；By the second duration after first switch is started, second switch is connected；Uninterrupted power supply is carried out by battery pack.The reliability of direct current supply can not only be effectively improved, and power supply quality has been effectively ensured by the DC uninterrupted electric power system and a variety of power supply strategies, the present invention of the present invention.
Description
Technical field
The present invention relates to power supply and distribution technical field, specifically for, the present invention is a kind of DC uninterrupted electric power system
And method of supplying power to.
Background technology
At present, it in special purpose vehicle or some important industrial circles, generally requires to provide uninterruption power source.To solve
The problem of uninterrupted power supply, often prepares stand-by power supply, when failure, manual switching to stand-by power supply occurs in main power source.This
Although kind of a conventional method can solve the problems, such as continuously to power due to main power source breaks down to a certain extent,
It is that this conventional uninterrupted power supply method still has reliability deficiency, is difficult to ensure that the problems such as power supply quality, can not meet
The needs of special purpose vehicle or some important industrial circles.
Therefore, the reliability and power supply quality of uninterrupted power supply how are effectively improved, becomes people in the art
The technical issues of member is urgently to be resolved hurrily and the emphasis studied always.
Invention content
To solve the problems such as reliability is low, power supply quality is poor existing for existing uninterrupted power supply method, present invention innovation carries
A kind of DC uninterrupted electric power system and method for supplying power to are gone out, reaching height by redundant power supply pattern and various control strategy can
It leans on, the purpose of the DC uninterrupted power supply of high-quality.
To realize above-mentioned technical purpose, the invention discloses a kind of DC uninterrupted electric power system, the electric power system packets
Battery pack, charger and at least one power supply unit are included, is connected between the output terminal of power supply unit and the input terminal of battery pack
The charger, the output terminal of power supply unit are connect with external output terminal, are gone here and there between the output terminal of battery pack and external output terminal
It is associated with first switch and the first thermistor.
The present invention not only ensure that the continuity and reliability of direct current supply, but also pass through series connection first by battery pack
Switch and the first thermistor realize the purpose of static switching Instantaneous Situation control, ensure that power supply quality, improve confession
Electric reliability；And then preferably solve problems of the prior art.
Further, second switch is also in series between the output terminal of the battery pack and the external output terminal, it is described
First switch and the first thermistor are in parallel with the second switch.
Based on above-mentioned improved technical solution, the present invention can effectively reduce the electricity expended during the work of the first thermistor
Can, and done sufficient preparation for possible power supply source switching next time.
Further, two poles of positive setting are also in series between the output terminal of the battery pack and the external output terminal
Pipe.
Based on above-mentioned improved technical solution, the present invention can avoid the reverse charging to battery pack, to reach effective guarantor
The purpose of battery pack is protected, so as to improve the service life of battery pack.
Further, it is in series with charging protection switch between the charger and the battery pack.
Based on above-mentioned improved technical solution, the present invention can avoid the overshooting problem to battery pack, to reach effective guarantor
The purpose of shield battery pack, the service life so as to improve battery pack.
In addition, based on above-mentioned improved technical solution, the present invention can also be filled according to different powering mode reasonable arrangements
Electric discharge strategy so that it is guaranteed that battery pack is safe, is optimal the purpose of the service life of control battery pack.
Further, the output terminal of the power supply unit and the output terminal of the battery pack have points of common connection, the public affairs
It is in series with main output soft start circuit between tie point and the external output terminal altogether, the main output soft start circuit includes the
Three switches, the second thermistor and the 4th switch, third switch and second thermistor connect, with the described 4th
Switch in parallel.
Based on above-mentioned improved technical solution, the present invention can avoid the problem that supplying power for outside moment surge impact, therefore,
The present invention can better adapt to non-purely resistive load.In addition, the present invention expends when can effectively reduce the work of the second thermistor
Electric energy.
Further, the power supply unit is three-phase mains power supply unit, single-phase mains-supplied equipment, chassis power taking power supply
At least one of equipment, diesel-electric set electric supply equipment.
Based on above-mentioned improved technical solution, powered by three-phase mains, single-phase mains-supplied, chassis power taking power supply, bavin
Oily electric set electric supply realizes that multi input redundant uninterruptible externally exports power supply strategy, so as to form optimal uninterrupted power supply
Strategy；Therefore, the present invention can effectively ensure the reliability of power supply.
Further, three-phase mains power supply unit, single-phase mains-supplied equipment, chassis power taking power supply unit and diesel oil hair
Parallel with one another between motor group power supply unit, the single-phase mains-supplied equipment includes single-phase rectifier device, the three-phase mains
Power supply unit includes three phase rectifier device.
Based on above-mentioned improved technical solution, the present invention can be powered by three-phase mains, single-phase mains-supplied, chassis take
External multi input redundant power supply is realized in power power supply, diesel-electric set electric supply.
To realize the above-mentioned technical purpose, the invention also discloses a kind of power supplies using above-mentioned DC uninterrupted electric power system
Method, the method for supplying power to include the following steps,
Step 1, powered using three-phase mains, single-phase mains-supplied, chassis power taking power supply and diesel-electric set electric supply
At least one of externally fed mode, pass through external output terminal export direct current；
Step 2, when detecting that externally fed inputs instant power-down, then first switch is connected in the first duration；Starting
By the second duration after first switch, second switch is connected；Uninterrupted power supply is carried out by battery pack.
The present invention innovatively employs static conversion strategy, it is ensured that provides stable, Gao Ke for load during static conversion
It leans on, the electric energy of high-quality, so as to effectively solve problems in the prior art.
Further, in step 2, after connecting second switch, by third duration, first switch is disconnected.
Further, in step 1, when detecting that externally output is terminated with non-purely resistive load, then in the 4th duration
Connect third switch；By the 5th duration after third switch is started, the 4th switch is connected；After connecting the 4th switch, by the
Six durations disconnect third switch.
Based on above-mentioned improved technical solution, the present invention can effectively reduce the electricity expended during the work of the second thermistor
Energy.
The present invention, which innovatively employs, exports power supply strategy, it is ensured that provides stable, Gao Ke for load in output power supply process
It leans on, the electric energy of high-quality.
Beneficial effects of the present invention are：DC uninterrupted electric power system and a variety of power supply strategies by the present invention, this hair
It is bright to effectively improve the reliability of direct current supply, and power supply quality has been effectively ensured.
Description of the drawings
Fig. 1 is the structure composition schematic diagram of DC uninterrupted electric power system.
Fig. 2 is the timing control schematic diagram of DC uninterrupted power supply strategy.
Specific embodiment
Detailed explanation is carried out to the DC uninterrupted electric power system of the present invention and method of supplying power to reference to the accompanying drawings of the specification
And explanation.
Embodiment one：
As shown in Figure 1, 2, a kind of DC uninterrupted electric power system is specifically disclosed in the present embodiment, which includes
Battery pack, charger and at least one power supply unit, in of the invention, power supply unit is three-phase mains power supply unit, single-phase city
At least one of electric power supply unit, chassis power taking power supply unit, diesel-electric set electric supply equipment；The number of each power supply unit
At least one is opened when measuring at least one, and working normally；In specific the present embodiment, set including above-mentioned four kinds of power supplies
It is standby, three-phase mains power supply unit, single-phase mains-supplied equipment, chassis power taking power supply unit and diesel-electric set electric supply equipment
Between it is parallel with one another, single-phase mains-supplied equipment includes single-phase rectifier device (included output blocking diode), for will be single-phase
Commercial power rectification is high voltage direct current, and three-phase mains power supply unit includes three phase rectifier device (included output blocking diode), is used for
It is high voltage direct current by three-phase mains rectification；For diesel-electric set electric supply equipment, also connect blocking diode VD1；For
Chassis power taking power supply unit, also connect blocking diode VD2；Four kinds of powering modes as long as there is one kind that can externally export as long as,
Independently of each other, it is independent of each other.The battery pack is high pressure lithium battery group, and is equipped with battery management system (BMS), and power supply unit
Output terminal and battery pack input terminal between serial connection charge device, the output terminal of power supply unit connect with external output terminal, externally
Output terminal loads for connecting, and first switch VT1 and the first temperature-sensitive are in series between the output terminal of battery pack and external output terminal
Resistance RT2 is also in series with second switch KM2, the heat of first switch VT1 and first between the output terminal of battery pack and external output terminal
Quick resistance RT2 is in parallel with second switch KM2, and first switch VT1, the first thermistor RT2, second switch KM2 are collectively constituted
Static transfer switch.The output terminal of power supply unit and the output terminal of battery pack have a points of common connection, the points of common connection with
Main output soft start circuit is in series between external output terminal, main output soft start circuit includes third switch KM1, the second temperature-sensitive
The switch KM0 of resistance RT1 and the 4th, third switch KM1 and the second thermistor RT1 series connection, and third switch KM1 and the second temperature-sensitive
Resistance RT1 is in parallel with the 4th switch KM0.In the present embodiment, first switch VT1 is semiconductor power device, has switch speed
Spend the characteristics of fast.
To avoid, to battery pack reverse charging, positive setting being also in series between the output terminal of battery pack and external output terminal
Diode VD3, from the output terminal of battery pack to external output extreme direction conducting, from external output terminal to the output terminal of battery pack
End in direction.To avoid the problem that overshoot, charging protection switch KM3 is in series between charger and battery pack.
Embodiment two：
The present embodiment, based on identical inventive concept, is to utilize the DC uninterrupted power supply in embodiment one with embodiment one
The method that system carries out uninterrupted power supply, which includes the following steps, as shown in Figure 1, 2, wherein, " 1 " table in Fig. 2
Show that switch is open-minded, " 0 " represents that switch disconnects.
Step 1, powered using three-phase mains, single-phase mains-supplied, chassis power taking power supply and diesel-electric set electric supply
At least one of externally fed mode, pass through external output terminal export direct current；When detect externally output be terminated with it is non-pure
During resistive load, then third switch KM1 is connected in the 4th duration；By the 5th duration after third switch KM1 is started, connect
4th switch KM0；After connecting the 4th switch KM0, by the 6th duration, third switch KM1 is disconnected.
Step 2, in this step, when battery management system detects that externally fed inputs instant power-down, then at first
First switch VT1 is connected in long；By the second duration after first switch VT1 is started, second switch KM2 is connected；Pass through battery
Group carries out uninterrupted power supply；After connecting second switch KM2, by third duration, switch VT1 is disconnected.Specifically, in order to overcome
Voltage difference between power supply buses and lithium battery group terminal voltage, the present invention are given by the thermistor RT2 with negative temperature coefficient
With buffering, in the moment that switch VT1 is attracted, thermistor RT2 cold conditions resistance values are big, and voltage difference is then concentrated on thermistor RT2,
It gradually heats up after thermistor RT2 electrifications, resistance value is gradually reduced, and external output voltage is gradually increasing, and avoids switching moment external
Output generates step voltage, influences the work of rear class electrical equipment；After pressure difference reaches secure threshold when RT2 both ends, it is attracted second and opens
KM2 (generally contactor) is closed, bypass disconnects switch VT1 and thermistor RT2, and to reduce power attenuation, while RT coolings are extensive
Multiple cold conditions resistance value, so as to static switching next time, the external output smoothing of whole process, power supply quality is high, by switching VT1 and heat
The timing control of quick resistance KM2, entire circuit are more reliable.
During lithium battery group is powered, when battery management system has detected externally fed input, then again
Second switch KM2 (if first switch VT1 is disconnected not yet, simultaneously switching off first switch VT1) is closed, restores externally fed
Pattern and so on forms uninterrupted power supply pattern.
After power supply buses are normal, externally during output, to adapt to non-purely resistive load, the present invention designs main output soft start
Circuit avoids supplying power for outside moment surge impact problem, is first attracted switch KM1, passes through the thermistor with negative temperature coefficient
RT1 is buffered, and the moment that switch KM1 is attracted, thermistor RT1 cold conditions resistance values are big, and voltage difference concentrates on thermistor RT1
On, it gradually heats up after RT1 electrifications, resistance value is gradually reduced, and external output voltage is gradually increasing, and avoids the surge electricity of switching moment
Stream, prevents influence of the surge to input；After pressure difference reaches secure threshold when RT1 both ends, it is attracted switch KM0 and (generally contacts
Device), it bypasses and breaks switch KM1 and thermistor RT1, reduce power attenuation, while thermistor RT1 coolings restore cold conditions resistance
Value, so that next soft start works, the external output smoothing of whole process, without big inrush current shock, circuit is reliable.
Certainly, when battery pack is used to be powered, when detecting that externally output is terminated with non-purely resistive load, then exist
Third switch KM1 is connected in 4th duration；By the 5th duration after third switch KM1 is started, the 4th switch KM0 is connected；It connects
After logical 4th switch KM0, by the 6th duration, third switch KM1 is disconnected.
It should be noted that " the first duration ", " the second duration ", " third duration " involved in the present embodiment, " when the 4th
It is long ", " the 5th duration ", " the 6th duration ", in order to represent that certain delay or time interval, occurrence can be the present invention's
Design is lower reasonably set or select.
To sum up, the present invention provides a kind of highly reliable DC uninterrupted power supply strategy, the strategy is with single-phase alternating current, three-phase city
Electricity, diesel engine unit power generation and chassis power takeoff generation unit and high pressure lithium battery group are mutually redundant to form uninterrupted power supply, are switched with static state
Instantaneous Situation control strategy, lithium battery group charge and discharge protecting, static handoff procedure dynamic characteristic control and main output soft start control
System, as long as of the invention solve in the technology that four kinds of inputs have a kind of and energy is reliable above, stablizes offer high-quality supplies electricity output
Problem, and effectively extend the life cycle of high pressure lithium battery group.In addition, based on battery management system, the present invention can also be right
Battery electric quantity state, externally fed state synthesis carry out state of the art monitoring and processing, and coordinate lithium battery charger, to charge and discharge
Electric process carries out charge mode control, health control and error protection, so as to extend battery life.
In addition, term " first ", " second " etc. are only used for description purpose, and it is not intended that indicating or implying relatively important
Property or the implicit quantity for indicating indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Person implicitly includes at least one this feature.In the description of the present invention, " multiple " are meant that at least two, such as two,
Three etc., unless otherwise specifically defined.
In the description of this specification, reference term " the present embodiment ", " some embodiments ", " is shown " one embodiment "
The description of example ", " specific example " or " some examples " etc. mean to combine the specific features of the embodiment or example description, structure,
Material or feature are contained at least one embodiment of the present invention or example.In the present specification, above-mentioned term is shown
The statement of meaning property is necessarily directed to identical embodiment or example.Moreover, specific features, structure, material or the spy of description
Point may be combined in any suitable manner in any one or more of the embodiments or examples.In addition, without conflicting with each other,
Those skilled in the art can be by the different embodiments or examples described in this specification and different embodiments or examples
Feature is combined.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Any modification, equivalent replacement and simple modifications for being made in content etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of DC uninterrupted electric power system, it is characterised in that：The electric power system includes battery pack, charger and at least one
Kind power supply unit, the charger of connecting between the output terminal of power supply unit and the input terminal of battery pack, the output of power supply unit
End is connect with external output terminal, and first switch and the first temperature-sensitive electricity are in series between the output terminal of battery pack and external output terminal
Resistance.
2. DC uninterrupted electric power system according to claim 1, it is characterised in that：The output terminal of the battery pack and institute
State and second switch be also in series between external output terminal, the first switch and the first thermistor with the second switch simultaneously
Connection.
3. DC uninterrupted electric power system according to claim 2, it is characterised in that：The output terminal of the battery pack and institute
State the diode that positive setting is also in series between external output terminal.
4. DC uninterrupted electric power system according to claim 3, it is characterised in that：The charger and the battery pack
Between be in series with charging protection switch.
5. DC uninterrupted electric power system according to claim 4, it is characterised in that：The output terminal of the power supply unit with
The output terminal of the battery pack has points of common connection, and main output is in series between the points of common connection and the external output terminal
Soft starting circuit, the main output soft start circuit include third switch, the second thermistor and the 4th switch, the third and open
Close and second thermistor connect, with the 4th switch in parallel.
6. DC uninterrupted electric power system according to claim 5, it is characterised in that：The power supply unit is three-phase mains
At least one of power supply unit, single-phase mains-supplied equipment, chassis power taking power supply unit, diesel-electric set electric supply equipment.
7. DC uninterrupted electric power system according to claim 6, it is characterised in that：It is three-phase mains power supply unit, single-phase
It is parallel with one another between mains-supplied equipment, chassis power taking power supply unit and diesel-electric set electric supply equipment, the single-phase city
Electric power supply unit includes single-phase rectifier device, and the three-phase mains power supply unit includes three phase rectifier device.
8. a kind of method of supplying power to of DC uninterrupted electric power system using described in claim 7, it is characterised in that：The supplier of electricity
Method includes the following steps,
Step 1, it is powered using three-phase mains, in single-phase mains-supplied, chassis power taking power supply and diesel-electric set electric supply
At least one externally fed mode exports direct current by external output terminal；
Step 2, when detecting that externally fed inputs instant power-down, then first switch is connected in the first duration；Starting first
By the second duration after switch, second switch is connected；Uninterrupted power supply is carried out by battery pack.
9. DC uninterrupted method of supplying power to according to claim 8, it is characterised in that：
In step 2, after connecting second switch, by third duration, first switch is disconnected.
10. DC uninterrupted method of supplying power to according to claim 8 or claim 9, it is characterised in that：
In step 1, when detecting that externally output is terminated with non-purely resistive load, then third switch is connected in the 4th duration；
By the 5th duration after third switch is started, the 4th switch is connected；After connecting the 4th switch, by the 6th duration, the is disconnected
Three switches.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810071936.1A CN108173266A (en) | 2018-01-25 | 2018-01-25 | A kind of DC uninterrupted electric power system and method for supplying power to |
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| CN201810071936.1A CN108173266A (en) | 2018-01-25 | 2018-01-25 | A kind of DC uninterrupted electric power system and method for supplying power to |
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| CN201810071936.1A Pending CN108173266A (en) | 2018-01-25 | 2018-01-25 | A kind of DC uninterrupted electric power system and method for supplying power to |
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| CN108832696A (en) * | 2018-07-27 | 2018-11-16 | 苏州市博得立电源科技有限公司 | Lithium battery group |
| CN112187065A (en) * | 2019-07-01 | 2021-01-05 | 中国石油化工股份有限公司 | Rectifying unit, device and system |
| CN112436596A (en) * | 2020-11-17 | 2021-03-02 | 大成电气科技(南京)有限公司 | Starting method of high-safety uninterrupted power supply |
| CN112671069A (en) * | 2020-12-30 | 2021-04-16 | 上海节卡机器人科技有限公司 | Super capacitor module and cooperative robot system |
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| CN112671069A (en) * | 2020-12-30 | 2021-04-16 | 上海节卡机器人科技有限公司 | Super capacitor module and cooperative robot system |
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